The IKS Gr'oth orbiting Deep Space K-7 in the remastered version of "The Trouble with Tribbles"

According to the script for the episode, the pronunciation for Gr'oth was "grrr-OTH". [1]

According to Dax, in "Trials and Tribble-ations", Koloth greatly regretted not ever getting the chance to meet Kirk in battle. This appears inconsistent with the battle that Kirk and Koloth had in the TAS episode. It was, however, possible Koloth had meant a "real" battle, where he had the goal of destroying Kirk's ship instead of just disabling it. Alternatively, Koloth may have regretted never facing Kirk in hand-to-hand combat. However, it was worth noting that, at the time "Trials and Tribble-ations" aired, TAS was not considered canon by the production staff.

The old-fashioned D7 model was built by Greg Jein specifically for DS9's special 30th anniversary tribute to The Original Series. While faithful to the original D7 model, Jein took liberties with the Gr'oth, including enhanced details similar to those of the K't'inga-class starship. The model was also painted with a vaguely greenish hue, similar to the color scheme of "future" Klingon starships.

Star Trek Log 4 and the Star Trek Concordance make references to an IKS Devisor as being the ship commanded by Koloth in the animated series episode "More Tribbles, More Troubles". Although this information was not canon, it was acquired from the episode's script (which can be purchased here). Aside from this, there was nothing to indicate it was a different ship.